Nissan Frontier. Manual — part 288
DLN-54
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: TX15B]
U1000 CAN COMM CIRCUIT
U1000 CAN COMM CIRCUIT
Description
INFOID:0000000009479679
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit communicate data but selectively reads required data only.
DTC Logic
INFOID:0000000009479680
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC REPRODUCTION PROCEDURE
With CONSULT
1. Turn the ignition switch ON.
2. Perform transfer control unit self-diagnosis. Refer to
DLN-17, "CONSULT Function (ALL MODE AWD/
Is DTC U1000 detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000009479681
LAN-14, "Trouble Diagnosis Flow Chart"
DTC
Display item
Malfunction detected condition
Possible cause
U1000
CAN COMM CIRCUIT
Transfer control unit is not transmitting/
receiving CAN communication signal for
2 seconds or more.
• CAN communication error
• Malfunction of transfer control unit
U1010 CONTROL UNIT (CAN)
DLN-55
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: TX15B]
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U1010 CONTROL UNIT (CAN)
Description
INFOID:0000000009479682
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit communicate data but selectively reads required data only.
DTC Logic
INFOID:0000000009479683
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC REPRODUCTION PROCEDURE
With CONSULT
1. Turn the ignition switch ON.
2. Perform transfer control unit self-diagnosis. Refer to
DLN-17, "CONSULT Function (ALL MODE AWD/
Is DTC U1010 detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000009479684
1.
CHECK TRANSFER CONTROL UNIT CONNECTOR
Check transfer control unit connectors for disconnection and deformation.
Is the inspection result normal?
YES
>> Replace transfer control unit. Refer to
DLN-92, "Removal and Installation"
.
NO
>> Repair or replace parts as necessary.
DTC
Display item
Malfunction detected condition
Possible cause
U1010
CONTROL UNIT (CAN)
Detecting error during the initial diagno-
sis of CAN controller of transfer control
unit.
Malfunction of transfer control unit
DLN-56
< ECU DIAGNOSIS INFORMATION >
[TRANSFER: TX15B]
TRANSFER CONTROL UNIT
ECU DIAGNOSIS INFORMATION
TRANSFER CONTROL UNIT
Reference Value
INFOID:0000000009479685
VALUE ON THE DIAGNOSIS TOOL
CONSULT data monitor item
Monitored item [Unit]
Content
Condition
Display value
VHCL/S SEN-FR [km/h]
or [mph]
Wheel speed (Front wheel)
Vehicle stopped
0 km/h (0 mph)
Vehicle running
CAUTION:
Check air pressure of tire under standard condi-
tion.
Approximately
equal to the indica-
tion on speedome-
ter (Inside of
±10%)
VHCL/S SEN-RR [km/h]
or [mph]
Wheel speed (Rear wheel)
Vehicle stopped
0 km/h (0 mph)
Vehicle running
CAUTION:
Check air pressure of tire under standard condi-
tion.
Approximately
equal to the indica-
tion on speedome-
ter (Inside of
±10%)
ENGINE SPEED [rpm]
Engine speed
Engine stopped
(Engine speed: Less than 400 rpm)
0 rpm
Engine running
(Engine speed: 400 rpm or more)
Approximately
equal to the indica-
tion on tachometer
BATTERY VOLT [V]
Power supply voltage for
transfer control unit
Ignition switch: ON
Battery voltage
2WD SWITCH [On/Off]
Input condition from 4WD
shift switch
4WD shift switch: 2WD
On
4WD shift switch: 4H and 4LO
Off
4H SWITCH [On/Off]
Input condition from 4WD
shift switch
4WD shift switch: 4H
On
4WD shift switch: 2WD and 4LO
Off
4L SWITCH [On/Off]
Input condition from 4WD
shift switch
4WD shift switch: 4LO
On
4WD shift switch: 2WD and 4H
Off
4L POSI SW [On/Off]
Condition of 4LO switch
• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed
4WD shift switch: 4LO
On
Except the above
Off
ATP SWITCH [On/Off]
Condition of ATP switch
• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed
4WD shift switch
: 4H to 4LO or 4LO to 4H
(While actuator motor is
operating.)
On
Except the above
Off
WAIT DETCT SW [On/
Off]
Condition of wait detection
switch
• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed
4WD shift switch
: 4H and 4LO
On
4WD shift switch: 2WD
Off
4WD MODE [2H/4H/4L]
Control status of 4WD
(Output condition of 4WD
shift indicator lamp and
4LO indicator lamp)
4WD shift switch
(Engine running)
2WD
2H
4H
4H
4LO
4L
TRANSFER CONTROL UNIT
DLN-57
< ECU DIAGNOSIS INFORMATION >
[TRANSFER: TX15B]
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PHYSICAL VALUES
VHCL/S COMP [km/h] or
[mph]
Vehicle speed
Vehicle stopped
0 km/h (0 mph)
Vehicle running
CAUTION:
Check air pressure of tire under standard condi-
tion.
Approximately
equal to the indica-
tion on speedome-
ter (Inside of
±10%)
SHIFT ACT 1 [On/Off]
Output condition to actua-
tor motor (clockwise)
• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed
4WD shift switch
: 2WD to 4H or 4H to 4LO
or 2WD to 4LO
On
Except the above
Off
SHIFT AC MON1 [On/
Off]
Check signal for transfer
control unit signal output
• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed
4WD shift switch
: 2WD to 4H or 4H to 4LO
or 2WD to 4LO
On
Except the above
Off
SHIFT ACT 2 [On/Off]
Output condition to actua-
tor motor (counterclock-
wise)
• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed
4WD shift switch
: 4LO to 4H or 4H to 2WD
or 4LO to 2WD
On
Except the above
Off
SHIFT AC MON2 [On/
Off]
Check signal for transfer
control unit signal output
• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed
4WD shift switch
: 4LO to 4H or 4H to 2WD
or 4LO to 2WD
On
Except the above
Off
SHIFT ACT/R MON [On/
Off]
Operating condition of ac-
tuator motor relay (integrat-
ed in transfer control unit)
• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed
When 4WD shift switch is
operated
On
When 4WD shift switch is
not operated
Off
SHIFT POS SW1 [On/
Off]
Condition of actuator posi-
tion switch 1
• Vehicle stopped
• Engine running
• A/T selector lever “N”
position
• Brake pedal depressed
4WD shift switch: 2WD
and 4LO
On
4WD shift switch: 4H
Off
SHIFT POS SW2 [On/
Off]
Condition of actuator posi-
tion switch 2
4WD shift switch: 4LO
On
4WD shift switch: 2WD
and 4H
Off
SHIFT POS SW3 [On/
Off]
Condition of actuator posi-
tion switch 3
4WD shift switch: 2WD
and 4H
On
4WD shift switch: 4LO
Off
SHIFT POS SW4 [On/
Off]
Condition of actuator posi-
tion switch 4
4WD shift switch: 4H and
4LO
On
4WD shift switch: 2WD
Off
4WD FAIL LAMP [On/
Off]
4WD warning lamp condi-
tion
4WD warning lamp: On
On
4WD warning lamp: Off
Off
2WD IND [On/Off]
Rear indicator of 4WD shift
indicator lamp condition
Rear indicator of 4WD shift indicator lamp: On
On
Rear indicator of 4WD shift indicator lamp: Off
Off
4H IND [On/Off]
Front and center indicator
of 4WD shift indicator lamp
condition
Front and center indicator of 4WD shift indicator lamp
: ON
On
Front and center indicator of 4WD shift indicator lamp
: OFF
Off
4L IND [On/Off]
4LO indicator lamp condi-
tion
4LO indicator lamp: On
On
4LO indicator lamp: Off
Off
Monitored item [Unit]
Content
Condition
Display value
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